With annual membership fees ranging from $60 to $120, it’s tempting to wring as much as you can from every Costco run: bulk packages of toilet paper, eggs in 24-packs, 10-pound bags of flour or a 12-pound Japanese Wagyu boneless ribeye roast (just $999.99). But as enticing as buying everything in bulk at Costco might be, it’s not always the wisest choice, says Tracie Fobes of money-saving website PennyPinchinMom.com. “For example, that big pack of toilet paper may look like a great deal, but what do you pay at your [local grocery] store? What is the price per roll there versus what you are getting at Costco?”

Understanding per-unit pricing is critical when buying in bulk. So too is understanding that you might not use up such large quantities before they spoil or expire. Here are 10 things you should think twice about before buying in bulk at Costco. Take a look at the list.